Struct mz_repr::relation::VersionedRelationDesc

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pub struct VersionedRelationDesc {
    inner: RelationDesc,
}
Expand description

A wrapper around RelationDesc that provides an interface for adding columns and generating new versions.

TODO(parkmycar): Using an immutable data structure for RelationDesc would be great.

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§inner: RelationDesc

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impl VersionedRelationDesc

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pub fn new(inner: RelationDesc) -> Self

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pub fn add_column<N, T>(&mut self, name: N, typ: T) -> RelationVersion
where N: Into<ColumnName>, T: Into<ColumnType>,

Adds a new column to this RelationDesc, creating a new version of the RelationDesc.

§Panics
  • Panics if a column with name already exists that hasn’t been dropped.

Note: For building a RelationDesc see RelationDescBuilder::with_column.

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pub fn drop_column<N>(&mut self, name: N) -> RelationVersion
where N: Into<ColumnName>,

Drops the column name from this RelationDesc. If there are multiple columns with name drops the left-most one that hasn’t already been dropped.

TODO(parkmycar): Add handling for dropping a column that is currently used as a key.

§Panics

Panics if a column with name does not exist or the dropped column was used as a key.

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pub fn latest(&self) -> RelationDesc

Returns the RelationDesc at the latest version.

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pub fn at_version(&self, version: RelationVersionSelector) -> RelationDesc

Returns this RelationDesc at the specified version.

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pub fn latest_version(&self) -> RelationVersion

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fn validate(&self)

Validates internal contraints of the RelationDesc are correct.

§Panics

Panics if a constraint is not satisfied.

Trait Implementations§

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impl Clone for VersionedRelationDesc

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fn clone(&self) -> VersionedRelationDesc

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for VersionedRelationDesc

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Serialize for VersionedRelationDesc

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more

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